So my buddy traded his glock 23 slide barrel etc, for a slide barrel etc off a 23C. So the only difference is the barrel and slide are ported. These are both gen3's so of course you would think no problem, just like anything else glock you change slides and your done. Here's where i need help, with the factory 23 lower he cannot "takedown" the 23C slide and barrel, it wont come off. He has to slide it back just enough to reach the plastic firing pin sleeve, take the rear plate off, all of this just to tear the gun down...Any ideas???? this REALLY has me stumped! Thanks in advanced everyone!